CVE-2021-20708 : Security Advisory and Response

This CVE involves NEC Aterm devices, specifically Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier, allowing authenticated attackers to execute arbitrary OS commands through a manipulated request to a specified URL.

Understanding CVE-2021-20708

This section provides insights into the nature and impact of CVE-2021-20708.

What is CVE-2021-20708?

CVE-2021-20708 is an OS Command Injection vulnerability impacting NEC Aterm devices, enabling attackers with authentication to run malicious operating system commands upon sending a tailored request to a particular URL.

The Impact of CVE-2021-20708

The exploitation of this vulnerability can result in unauthorized execution of commands on the targeted device, posing a significant security risk to the integrity and confidentiality of affected systems.

Technical Details of CVE-2021-20708

Delve deeper into the technical aspects of CVE-2021-20708 to understand its implications and operational dynamics.

Vulnerability Description

The vulnerability lies in the NEC Aterm devices, allowing attackers with authorized access to execute arbitrary OS commands by exploiting the flaw in processing certain URL requests.

Affected Systems and Versions

NEC Aterm devices with Aterm WF1200CR firmware Ver1.3.2 and earlier, Aterm WG1200CR firmware Ver1.3.3 and earlier, and Aterm WG2600HS firmware Ver1.5.1 and earlier are susceptible to this security issue.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting and sending a malicious request to a specific URL, leveraging authenticated access to execute unauthorized commands on the affected device.

Mitigation and Prevention

Discover the necessary steps to mitigate the risks associated with CVE-2021-20708 and prevent potential security breaches.

Immediate Steps to Take

Update the NEC Aterm devices to the latest firmware versions provided by NEC Corporation.
Employ network security measures to restrict access and monitor for unusual activities.

Long-Term Security Practices

Regularly audit and assess the security configurations of NEC Aterm devices.
Educate users on cybersecurity best practices to enhance overall security posture.

Patching and Updates

Stay informed about security advisories from NEC Corporation and promptly apply recommended patches and updates to safeguard against known vulnerabilities.